This book is filled with adventure & excitement. It is about an alien war and how certain of the Lorien people were sent to earth to be protected by their guardians until their powers developed and they would be able to fight their enemies (the Mogadorians). Nine children were sent, each with a guardian (Cepan) to protect them. Originally, a charm protected them and they could only be killed in order. That charm was broken in the first book (I am Number Four). Now the children need to find each other and find a way to defeat the Mogadorians and return life to their planet.